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  <title>使用 MIME base64 对数据进行编码</title>
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  <div id="layout-content"><div id="function.base64-encode" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">base64_encode</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">base64_encode</span> &mdash; <span class="dc-title">使用 MIME base64 对数据进行编码</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.base64-encode-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>base64_encode</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
   ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   使用 base64 对 <code class="parameter">data</code> 进行编码。
  </p>
  <p class="para">
   设计此种编码是为了使二进制数据可以通过非纯
   8-bit 的传输层传输，例如电子邮件的主体。
  </p>
  <p class="para">
   Base64-encoded 数据要比原始数据多占用 33% 左右的空间。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.base64-encode-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">data</code></dt>

     <dd>

      <p class="para">
       要编码的数据。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.base64-encode-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   编码后的字符串数据， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.base64-encode-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4882">
    <p><strong>Example #1 <span class="function"><strong>base64_encode()</strong></span> 示例</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$str&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'This&nbsp;is&nbsp;an&nbsp;encoded&nbsp;string'</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">base64_encode</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw==
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.base64-encode-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="base64_decode.html" class="function" rel="rdfs-seeAlso">base64_decode()</a> - 对使用 MIME base64 编码的数据进行解码</span></li>
    <li class="member"><span class="function"><a href="chunk_split.html" class="function" rel="rdfs-seeAlso">chunk_split()</a> - 将字符串分割成小块</span></li>
    <li class="member"><span class="function"><a href="convert_uuencode.html" class="function" rel="rdfs-seeAlso">convert_uuencode()</a> - 使用 uuencode 编码一个字符串</span></li>
    <li class="member"><a href="http://www.faqs.org/rfcs/rfc2045" class="link external">&raquo;&nbsp;RFC 2045</a> 6.8 章节</li>
   </ul>
  </p>
 </div>

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